The Study On The Effect Of Different Factors On Water And Nitrogen Heat Transport Of Film Hole Irrigation Under Facilities Condition

The essay adopts the technical route of the combination of the indoor test and theoretical analysis based on the analysis of the domestic and foreign film hole irrigation theory and related technical research and combined with the natural science fund projects in hebei province (C2011402042). The effect of different factors on water and nitrogen transport and distribution and facilities microclimate of film hole irrigation under facilities condition after free infiltration of fertilizer is analyzed. The result shows:1%The effect of different film hole diameter on water and nitrogen transport and distribution and facilities microclimate of film hole irrigation under facilities condition after free infiltration of fertilizer is analyzed. The soil water and nitrogen content reduces with time which reaches the most in the hole center and reduces away from it; soil water content reduces with the increase of the film hole diameter while the nitrogen content increases and the average temperature of horizontal and vertical direction increases slightly at the same position; average air humidity of the facilities microclimate gets bigger from the first day to the seventh day after irrigation; the model of the soil water and nitrogen content changes with the hole diameter is built.2、The effect of different irrigating water amount on water and nitrogen transport and distribution and facilities microclimate of film hole irrigation under facilities condition after free infiltration of fertilizer is analyzed. It is opposite to the film hole diameter; soil water content increases with the increase of the irrigating water amount while the nitrogen content reduces and the average temperature of horizontal and vertical direction reduces slightly at the same position;the model of the soil water and nitrogen content changes with the irrigating water amount is built.3、 The effect of different fertilizer concentration on water and nitrogen transport and distribution and facilities microclimate of film hole irrigation under facilities condition after free infiltration of fertilizer is analyzed, soil water content reduces with the increase of the fertilizer concentration while the nitrogen content increases and the average temperature of horizontal and vertical direction increases slightly at the same position; average air humidity of the facilities microclimate gets bigger from the first day to the seventh day after irrigation; the model of the soil water and nitrogen content changes with the fertilizer concentration is built.The research results provide a theory proof for further development of farmland efficient irrigation and fertilization and reducing nitrogen influence on environment and water and nitrogen heat coupling characteristics.